With the Fed&rsquo;s next policy meeting looming this week, hedge funds are exiting from gold. Speculators cut their bets on a bullion rally by the most in more than three months. Holdings in global exchange-traded funds backed by the metal are down from a three-year high in August.&nbsp;Aggregate open interest in New York futures is mired in the longest slump since May. Speculation is mounting that Fed officials,&nbsp;in a statement scheduled for release...